29 Apr 2011 12:02 pm. It should be pretty easy to see that it is a nose really. If you watch some original artwork you'll see that the white, shiny area isn't even near one of the edges of the nose and can therefore not be a tooth.t should be pretty easy to see that it is a nose really. If you watch some original artwork you'll see that the white, shiny area isn't even near one of the edges of the nose and can therefore not be a tooth.
S N 2). Nucleophilic substitution is the reaction of an electron pair donor (the nucleophile, Nu) with an electron pair acceptor (the electrophile). An sp 3 -hybridized electrophile must have a leaving group (X) in order for the reaction to take place.ince the nucleophile is free to attack from either side, this reaction is associated with racemization. In both reactions, the nucleophile competes with the leaving group. Because of this, one must realize what properties a leaving group should have, and what constitutes a good nucleophile.
Overview: The general form of the SN2 mechanism is as follows: nuc: = nucleophile X = leaving group (usually halide or tosylate). The SN2 reaction involves displacement of a leaving group (usually a halide or a tosylate), by a nucleophile.